Outflows at the edges of active regions: Contribution to solar wind formation?

The formation of the slow solar wind has been debated for many years. In this Letter we show evidence of persistent outflow at the edges of an active region as measured by the EUV Imaging Spectrometer on board Hinode. The Doppler velocity ranged between 20 and 50 km s -1 and was consistent with a st...

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Autores principales: Harra, L.K., Sakao, T., Mandrini, C.H., Hara, H., Imada, S., Young, P.R., Van Driel-Gesztelyi, L., Baker, D.
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Solar wind
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_0004637X_v676_n2PART2_pL147_Harra
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_0004637X_v676_n2PART2_pL147_Harra2023-10-03T14:02:06Z Outflows at the edges of active regions: Contribution to solar wind formation? Harra, L.K. Sakao, T. Mandrini, C.H. Hara, H. Imada, S. Young, P.R. Van Driel-Gesztelyi, L. Baker, D. Solar wind The formation of the slow solar wind has been debated for many years. In this Letter we show evidence of persistent outflow at the edges of an active region as measured by the EUV Imaging Spectrometer on board Hinode. The Doppler velocity ranged between 20 and 50 km s -1 and was consistent with a steady flow seen in the X-Ray Telescope. The latter showed steady, pulsing outflowing material and some transverse motions of the loops. We analyze the magnetic field around the active region and produce a coronal magnetic field model. We determine from, the latter that the outflow speeds adjusted for line-of-sight effects can reach over 100 km s -1 . We can interpret this outflow as expansion of loops that lie over the active region, which may either reconnect with neighboring large-scale loops or are likely to open to the interplanetary space. This material constitutes at least part of the slow solar wind. © 2008. The American Astronomical Society. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0004637X_v676_n2PART2_pL147_Harra
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Solar wind
spellingShingle Solar wind
Harra, L.K.
Sakao, T.
Mandrini, C.H.
Hara, H.
Imada, S.
Young, P.R.
Van Driel-Gesztelyi, L.
Baker, D.
Outflows at the edges of active regions: Contribution to solar wind formation?
topic_facet Solar wind
description The formation of the slow solar wind has been debated for many years. In this Letter we show evidence of persistent outflow at the edges of an active region as measured by the EUV Imaging Spectrometer on board Hinode. The Doppler velocity ranged between 20 and 50 km s -1 and was consistent with a steady flow seen in the X-Ray Telescope. The latter showed steady, pulsing outflowing material and some transverse motions of the loops. We analyze the magnetic field around the active region and produce a coronal magnetic field model. We determine from, the latter that the outflow speeds adjusted for line-of-sight effects can reach over 100 km s -1 . We can interpret this outflow as expansion of loops that lie over the active region, which may either reconnect with neighboring large-scale loops or are likely to open to the interplanetary space. This material constitutes at least part of the slow solar wind. © 2008. The American Astronomical Society. All rights reserved.
format JOUR
author Harra, L.K.
Sakao, T.
Mandrini, C.H.
Hara, H.
Imada, S.
Young, P.R.
Van Driel-Gesztelyi, L.
Baker, D.
author_facet Harra, L.K.
Sakao, T.
Mandrini, C.H.
Hara, H.
Imada, S.
Young, P.R.
Van Driel-Gesztelyi, L.
Baker, D.
author_sort Harra, L.K.
title Outflows at the edges of active regions: Contribution to solar wind formation?
title_short Outflows at the edges of active regions: Contribution to solar wind formation?
title_full Outflows at the edges of active regions: Contribution to solar wind formation?
title_fullStr Outflows at the edges of active regions: Contribution to solar wind formation?
title_full_unstemmed Outflows at the edges of active regions: Contribution to solar wind formation?
title_sort outflows at the edges of active regions: contribution to solar wind formation?
url http://hdl.handle.net/20.500.12110/paper_0004637X_v676_n2PART2_pL147_Harra
work_keys_str_mv AT harralk outflowsattheedgesofactiveregionscontributiontosolarwindformation
AT sakaot outflowsattheedgesofactiveregionscontributiontosolarwindformation
AT mandrinich outflowsattheedgesofactiveregionscontributiontosolarwindformation
AT harah outflowsattheedgesofactiveregionscontributiontosolarwindformation
AT imadas outflowsattheedgesofactiveregionscontributiontosolarwindformation
AT youngpr outflowsattheedgesofactiveregionscontributiontosolarwindformation
AT vandrielgesztelyil outflowsattheedgesofactiveregionscontributiontosolarwindformation
AT bakerd outflowsattheedgesofactiveregionscontributiontosolarwindformation
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